Spindle-driving mechanism.



A. E. NEWTON.

SPINDLE DRIVING MECHANISM.

APPLICATION FILED NOV. 30,1910.

1,105,529. Patented July 28, 1914.

Milli 4:2

'6 WWMW i CVQ/Mzi M- UNITED STATES PATENT OFFICE.

ALBERT E. NEWTON, F WORCESTER, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO REED-PRENTICE COMPANY. OF WORCESTER, MASSACHUSETTS, A COR- 'PORATION OF MASSACHUSETTS.

SPINDLE-DBIVING MECHANISM.

Specification of Letters Patent.

Patented July 28, 19:14.

Appllcatton flled November 30, 1910. Serial No. 594,863.

To all whom it may concern Be it known that I, .ALBERT E. NEWTON, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and 'useful SpindleDriving Mechanism, of which the following is a specification.

This invention relates to a driving mechanism for spindles for upright drills, tapping machines, and other machine tools.

The principal objects of the invention are to provide a simple and eflective support for a longitudinally slidable spindle and for the pulley for driving it of such character that the pulley will be supported at both sides and yet of such a character that a lost motion connection can be located below the pulle for connecting the pulley with the spin le to drive the latter; also to rovide a simplified construction in which i there is any tendency of the driving belt to twist the pulley that will not be imparted directly to the spindle to bind the latter in the bearings.

Another object of the invention is to provide a simple and convenient means for supporting the connected pulleys between two belts by which power is transmitted to said spindle pulley, and at the same time to provide for convenient adjustment of the same to take up the slack of both belts at the same time.

Further objects and advantages of the in vention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which Figure 1 is a side elevation of a portion of an upright drill showing one way in which this invention can be applied thereto. Fig. 2 is a central sectional view of the spindle and pulley thereon; and Fig. 3 1s a central sectional view of the transmitting pulle The invention is shown as applied to a particular machine, but is ca able of application to man other kinds 0 machinery. It is shown herein as applied to mechanism in which a main driving pulley of the cone variety (not illustrated herein) delivers power to a driving belt which passes over a cone pulley 11. This cone pulley is fixed to a shaft 12 to which a pulley 13 is also fixed. This pulley 13 by a belt 14 drives a pulley 15. from which power is transmitted to a spindle 16.

The goose neck or frame of the machine 1s shown as provided with bosses on which a pivot pin 21 is mounted. On this 1s pivoted a support 22 having a projection 23 adapted to engage the frame F when the support drops back to constitute a stop therefor. But in ordinary practice this projection is held out of contact with the frame F by the tension of the belt 14. On the support 22 are two arms 24 and 25 having alined passages therethrough for receiving a of rods 26 and 27, the latter of whic is screw-threaded. These rods are in alinement and are connected at their inner ends so that they virtually constitute a single rod. They are connected by reduced ends 28 which are fixed in sockets in a hub 29. This hub is provided with ball bearings 30 for supporting the shaft 12. On the screw threaded rod 27 is a hand wheel 31 having an internally screw threaded hub extending through the arm 25 and having a collar- 32 on the opposite side thereof. The turning of this hand wheel will cause the rod 27 to move longitudinally and thus shift the position of the hub 29 and rod 26. This results in tightening or loosening both bolts 10 and 14. To prevent the rotation of the rods 26 and 27 and the hub the latter is provided with a projection 35 entering a longitudinal slot 83 in the frame 22. lVith this construction it will be seen that the tensions of both belts can be adjusted with great nicety and sufficient rapidity for all ordinary purposes. The tension on the belt 14 will always be greater than that on the belt 10 on account of the weight of the frame 22 which is entirely supported by the belt 14.

The pulley 15 for the spindle 16 is provided with a sleeve extending through the same and projecting from both sides. This sleeve is mounted in ball bearings ll, one set being located on each side, in the present case one above and one below the pulley. The upper set of ball bearings is mounted in a well known way in a hub 42 on the frame, the lower set is also mounted in a hub or enlargement 43. These two hubs are integral with the frame and havea space between them for the pulley. This sleeve is fixed to the pulley but not to the spindle 1(3. To the sleeve is fixed a driving collar- 44 which therefore rotates with the pulley. This driving collar is provided with onaor more headed screws 45 which have a loose fit in passages 46 in a collar 47 which is keyed to the spindle in such a way that the spindle will always be driven from it, although the spindle is vertically movablein it.

In order to keep out dust and dirt, catch the oil from the bearings,and also .to properly center the collar 47, a cap 48 is provided'fixed on the bottom of the hub a3 and having a cavity therein for the enlargement of the collar 47' and for the small. portion thereof. In this way the pulley'45 is supported on both sides at -a distance from its center by"the bearings. Thus a firm and practicable support is" provided and any tendency of this pulley to turn or twist on its bearings is not imparted directly to the spindle to cause the same to bind in the collar 47 because of the loose connection between the screws 45 and this collar. Therefore the parts can adjust themselves to the j ordinary conditions existing in a machine of fore I do not wish to be limited to all the thereof, a collar rotatable with the pulley.

and located below the same and beyond the details of construction herein shown and described, but

What I do claim is 1. In a device of the character described, the combination of a pulley, a sleeve fixed thereto and extending beyond the ends thereof, bearings for said sleeve beyond the ends of the pulley, a driving collar rotatable with the pulley, a second collar, a loose connec;

tion between the two collars, and a spindle keyed to the second collar and passing through the sleeve.

2. In a device of the character described, the combination of a pulley, a sleeve therein,

a spindle passing freely through the sleeve,-

bearings for the spindle beyond the ends bearings thereof, a second collar'towhich the spindle is splined, anda. loose connection between the two collars.

3. In a device of the character. described, the combination of a frame having two hubs in vertical alinement with a space between them, a sleeve passing across said space, bearings in the two hubs for the sleeve, a

pulley fixed to the sleeve and located between the two hubs,,a driving. collar fixed to said sleeve, headed screws projecting from the collar, a second collar through which said screws loosely pass, and a spindle passing through the sleeve.., an d through both collars and keyed to the second collar, said spindle. being movable longitudinally therein. i i

4. In a device of the character described, the combination of a frame having two hubs in vertical alinement with a space between them a sleeve passing across said space, bearings in the two hubs for the sleeve, a pulley fixed to the sleeve and located between the two hubs, a driving collar fixed-to said sleeve, headed screws projecting from the collar, a second collar through. which said screws loosely pass, 'a] spindle passing through the sleeve and through both collars" and keyed to the second collar, said s indle being movable longitudinally, one 0 said collars being located in one of said hubs and the other projecting from it, and a cap on the end of the latter hub in which said other bearings in the two hubs for the sleeve, a

pulley fixed to the sleeve and located be tween the two hubs a driving collar fixed to said sleeve below the pulley andbelow the lower bearing, headed screws projecting downwardly from the bottom of. said collar,-

a second collar through which said screws loosely pass, a spindle passing through the sleeve and through both collars and keyed to the second collar, saidspindle being movable longitudinally thereon, and alcap on the" bottom of the lower ,hub fitting" the: lower collar.

- 6. In a machine of the character described,

the combination of a framehav'ina' a pair of t hubs separated from each other and located one above the other, 'ajpull'ey located between saidhubs, avertical sleeve to which the pulley is fixed, bearings for the sleeve 1n' the hubs beyond the ends of the "pulley, a spindle fitting loosely in, and supported solely by the sleeve and movable axially therein, and

a'lost motion connection between the bottom of the sleeve and the spindle for driving the spindle in all positions thereof.

In te'sti" onv whereof I have hereunto set my hand, in the presence ofjtwo subscnbing witnesses, j ALBERT Nnwrou. Witnesses:

Answer E. Far,

'. C.;Fohnnsr Wesson. 

